<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert
        show-icon
        title="注意：只允许为第三级分分类设置相关参数!"
        type="warning"
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name'
            }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- 标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数列表 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="removeTag(index,scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 增加标签按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParam(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性列表 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
             <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="removeTag(index,scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 增加标签按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParam(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <el-form
        :model="addForm"
        :rules="formRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <el-form
        :model="editForm"
        :rules="formRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //所有商品分类
      cateList: [],
      //双向绑定级联选择框选中的id数组
      selectedCateKeys: [],
      //被激活页签名称
      activeName: "many",
      //动态参数属性
      manyTableData: [],
      //静态参数属性
      onlyTableData: [],
      //控制添加对话框显示隐藏
      addDialogVisible: false,
      //添加表单对象
      addForm: {
        attr_name: ""
      },
      //修改表单对象
      editForm: {
        attr_name: ""
      },
      //添加表单验证规则
      formRules: {
        attr_name: [
          { required: true, message: "输入不能为空", trigger: "blur" }
        ]
      },
      //修改对话框显示
      editDialogVisible: false
      
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.cateList = res.data;
    },
    //级联选择框选中改变
    handleChange() {
      this.getParamsData();
    },
    //tabs 页签点击事件
    handleTabClick() {
      this.getParamsData();
    },
    //获取商品分类参数
    async getParamsData() {
      //获取参数/属性
      const {
        data: res
      } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数失败");
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        item.inputVisible = false;
        item.inputValue = '';
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //添加对话框关闭
    addDialogClose() {
      this.$refs.addFormRef.resetFields();
    },
    // 添加对话框确定
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    //展示修改对话框
    async showEditDialog(attrId) {
      const {
        data: res
      } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        { params: { attr_sel: this.activeName } }
      );
      console.log(res);
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //修改对话框关闭
    editDialogClose() {
      this.$refs.editFormRef.resetFields();
    },
    //修改对话框确定
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const {
          data: res
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { 
              attr_name: this.editForm.attr_name, 
              attr_sel: this.activeName,
              //需要将参数下面的可选标签属性加上,否则会清空
              attr_vals: this.editForm.attr_vals
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.editDialogVisible = false;
        this.getParamsData();
      });
    },
    //根据点击删除参数
    async removeParam(attrId) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attrId}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败");
      }
      this.$message.success("删除参数成功");
      this.getParamsData();
    },
    //输入文本框失去焦点或按下回车
    handleInputConfirm(row) {
        //输入内容去除两边空字符后长度为0,表示输入的是空字符
        if(row.inputValue.trim().length === 0) {
            row.inputValue = '';
            row.inputVisible = false;
            return
        }
        //没有return,说明输入了内容
        row.attr_vals.push(row.inputValue);
        row.inputValue = '';
        row.inputVisible = false;
        this.saveAttrVals(row)
        
        
    },
    //将attr_vals操作保存到服务器
    async saveAttrVals(row) {
        //发送请求保存数据
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
        });
        if(res.meta.status !== 200) {
            return this.$message.error("修改参数项失败");
        }
        this.$message.success("修改参数项成功");
    },
    //点击按钮,显示文本输入框
    showInput(row) {
        row.inputVisible = true;
        //文本框自动获得焦点
        //$nextTick 作用是:当页面元素被重新渲染后,才会执行回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除标签
    removeTag(index,row) {
        row.attr_vals.splice(index,1);
        this.saveAttrVals(row);
    }
  },
  computed: {
    isBtnDisable() {
      if (this.selectedCateKeys.length === 0) return true;
      return false;
    },
    // 分类id
    cateId() {
      return this.selectedCateKeys[2];
    },
    //动态计算标题文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    }
  }
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
    width: 150px;
}
</style>